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<br />ffiOJECJr.REPORT
<br />ON
<br />PINON CiiNON Df.M
<br />TRINIDAD,' COLORADO
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<br />APPENDIX II
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<br />BASIS OF DESIGN
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<br />I - INJ'RODUCTION . .
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<br />,,'1-01. Purpose and scope. - The purpose of this appendix is to ,
<br />present the basis of design, exclusive of hydrology, of the project 'n, ;',
<br />plan and structures therein for the Pinon Canon Dam. Design criteria,
<br />assumptions, and analyses for the' embankment. hy<j:eaulic and structural
<br />design of the principal enginee'ring,fe~tur~s are described and dis-
<br />cussed.' .
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<br />!I - EMBANKMENJ' DESIGN
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<br />2-01. Soils investigation. - To secure the info:rJ1l~tion necessary
<br />.for the preparation of the pr,oject report. a soils exploration program
<br />waS' ~onipleted embracing fqwl(lat:ion investigationsand;\i;p.vef!tiga:tio.ns
<br />for embanklne'ht::'nia'terials, ',:F(!\fudation explor ations',fOi-i')t1ie" ",qam w~r!3:; ,;
<br />'abcolliplish~d bf tour aug!3I! ',l1(it!"s ,drilled to the top of thio} shale or ':
<br />sandstqnef.'ori'iiation, o{: tQ'tf}e' maximum depth of' 26, feet, , Soils for '.
<br />the dam"~D1b8.nlal1ent to be obtained from the borrow area . upstream from. \
<br />the'damWere investigated by nine auger holes,drill.ed1;o,depths var:Y'-,,:
<br />ing froirf:7 to 20 feet. The.:ilocation .of the auger holeij'~~dgrlJ.phic'c~",;,:
<br />logs 'of, the' subsurface explorations indicating soil classification or :'"
<br />foundation mater:i;als and errl'danlanent materials are:shown on plate 2 of. '.,
<br />the pro'ject report. Samples obtained from the above held exploratio~:~'
<br />were tested' in 'the laboratory for gradation, Atterberg limits, optim\uii',~
<br />unit. dry w.eight; and optimum moisture content. The results of these ,""
<br />laboratory tests 'are summarized in table 1.
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<br />2~02, Foundation conditions. - Results Of the tests performed
<br />on , the 'dam foundation material, show that the foundation .would be im_
<br />Ilerviouii, except for the top 4 feet of the stream bed,whi<;lp. is classi-
<br />fied as gravelly silty sand. .The 'gravelly s;Lltysand deP9~it in the
<br />stream lies entirely within a"trencheroded .in ,!;hel1;laale. ,.:This
<br />material would be removed in order that the entire foundation be of
<br />imptlririous' material/ thereby eliminating the :posllibil:i.tY"of seepage.
<br />In addition, all "of' the exposed weather..d ,,shalew6UId be'-;,'r~mov..d during
<br />the operation of stripping and removal of the silty sand"deposit. .. "
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<br />Appendix II
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